It can take time to build up your personal freelance business. Yet, there is more demand than ever for freelancers. So, if you want to kick start making money online through freelancing you can join one of the top freelance networks, such as Flexjobs, SolidGigs, Upwork, Fiverr, or PeoplePerHour. Sign up, build your profile, upload some samples of your work and start making extra money by doing small freelance jobs.
These days, there are many more online retail options on which to cash in. Alongside the tried-and-tested web marketplaces of Craigslist and eBay are stylish sites like Threadflip, a place for sellers to turnaround their used women's apparel. ModCloth, which peddles vintage threads while carefully integrating social and mobile aspects has become increasingly popular, earning its 27-year-old husband-wife founders Eric and Susan Gregg Koger a spot on Forbes 30 Under 30 list.
Want to know how to make money fast driving Uber? If you own your own side business, you can showcase your products to your passengers if they’re interested. Not all will be though. However, if one expresses interest in your products, you can have products for sale under the driver’s seat for a passenger to sift through. If customers don’t have the cash, you can ask them to pay for the cost of it with Uber’s tip function.
Find a profitable niche. Starting with your interests, write down as many niche ideas as you can. Think about topics people might search online. Ideas include passions (like surfing or body building), fears (like spiders or speaking in front of crowds) and problems (like getting out of debt). Do keyword research to see it others are interested in the topic. Find out if a domain name is available that matches the keyword 100 percent. 
Also called print on demand, this method of passive income works differently than, say, renting out real estate or playing the stock market. The overhead is extremely low—sellers don’t have to worry about storing any inventory or making physical items. Companies like Teespring, Redbubble, and Merch by Amazon have sprung up this decade to fuel the passive income industry. Their sole function is to handle the logistics of printing and shipping while paying out design royalties to people like Zubia, whose bestsellers have said things like “Awesome Since 1978” and “Born in Chicago.”
If you’re looking for inspiration, my friend Michelle Schroeder-Gardner of the website Making Sense of Sense has become the expert on all things affiliate marketing. Michelle earns more than $100,000 per month from her blog and the bulk of her income comes from affiliate sales. Michelle has had so much success with affiliate marketing that she even has her own course called Making Sense of Affiliate Marketing.